[Mesa-users] Massive star evolution after CO core formation

[Rob Farmer]

Hi
Firstly, the terminal output contains a string in the bottom right corner
that tells you what is currently setting mesa's timestep. You can then
search for that string in the controls.default file to find an appropriate
control that you could tweak (or atleast use to understand what physics is
setting the current limit).

It's hard to say what is limiting your timesteps without seeing any plots.
I would suggest setting up the pgstar inlist from
https://zenodo.org/record/3986828 which will then contain alot of
information about your star and will make it much much easier to debug why
a problem is occurring.

Rob


On Thu, 10 Sep 2020 at 11:56, Jelena Petrović <jpetrovic at aob.rs> wrote:

> Dear all,
>
> I am evolving massive stars (above 30Ms) and I have noticed that most of
> my models have problems evolving further than CO core,
> time steps get really small and models do not progress anymore.
> Only sometimes I manage to get the evolution all the way to Fe core. It
> seems that lower mass models do slightly better.
>
> I though this is because of extended hydrogen envelope, so I have tried
> to evolve helium stars. However, the same happens.
> When the core is about 25% C and 75% O, the models run, but with
> extremely small time steps.
> Just to note that stellar wind is also switched off to ensure that this
> is not the reason for smaller time steps.
>
> Does anybody know what could be the problem?
>
> Many thanks!
> Jelena
>
> ----------------------------------------
> Dr. Jelena Petrovic
> Senior Research Associate
> Astronomical Observatory Belgrade
> Serbia
> ----------------------------------------
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